PORTLAND, Maine — The combination of gerrymandering and geography that helped Republicans build an advantage in US House seats by drawing new districts after the 2010 Census has been largely absent in Maine.

Maine Democrats and Republicans are largely happy with a reapportionment that left the current congressional districts mostly intact.

Republicans initially tried to redraw the lines to divide Maine’s two congressional districts into an east-west configuration instead of north-south. But in the end, the districts remained much the same.

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Under the compromise, Waterville and Winslow joined the First District. Lewiston and Auburn remained in the Second District, and 11 municipalities shifted to that district: Unity Township, Albion, Sidney, Belgrade, Rome, Vienna, Mount Vernon, Gardiner, West Gardiner, Monmouth, and Randolph.

Democrats retain an edge in both districts, but it is possible the change could favor the GOP over the Democrats if there is a razor-thin margin in the race for the Second District seat left open by six-term Democratic Representative Mike Michaud’s decision to run for governor.